ASX is also stored as WSX sometimes. And sometimes even serialized like WPL, which is basically SMIL in various variations (no shortage of weird NIH formats in Windows land).

UTF-8 and file:/// URL support

One thing that came up with developing the file browser plugin is the varied support for file:/// URLs and platform-dependent UTF-8 encoding. This likely goes for direct-file invocation as well as playlist-contained references. Here grouped by samples: